Ear Ossicles Evolution
Location: Outside U.S.
Date: Spring 2013
How animals have three ears ossicles?
Thanks for the question. I am not sure why animals have three ear ossicles (as opposed to two or four). The presence of three ossicles can be construed as evidence for a common ancestor.
I hope this helps. Please let me know if you have more questions.
The evolution of the auditory structures in the human has been thoroughly described. One of many sources explaining this evolution can be found:
Click here to return to the Zoology Archives
Update: November 2011